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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e79a9fe4b360824fec57722ead220e43f3fd884737fd64cc91b956029eb90b' 
  AND token = '5Dlv3l2ZydkarfmI+yZQmsj1/KgQa/SArBZ+x4aZY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}